Current carrying systems and methods of assembling the same

ABSTRACT

A current carrying system for use in transporting electrical current between a plurality of electrical devices is provided. The current carrying system includes a busbar having a first axial end, a second axial end, an electrically conductive shaft extending from the first axial end to the second axial end, and at least one cooling feature defined in at least a portion of the electrically conductive shaft. The current carrying system also includes a casing that defines a busbar channel configured to receive the busbar such that the casing at least partially circumscribes the busbar. The current carrying system also includes an air vent defined by the at least one cooling feature and the casing, wherein the air vent is in flow communication with ambient air, and the cooling feature is configured to facilitate a flow of air from the ambient air through the air vent.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/189,346 filed Feb. 25, 2014, which is hereby incorporated byreference in its entirety.

BACKGROUND

The field of the disclosure relates generally to current carryingsystems, and, more specifically, to current carrying systems having atleast one profiled busbar that facilitates increased current carryingcapacity.

Existing current carrying systems generally include one or more solidelectrically conductive busbars that transport electrical power betweena plurality of electrical components. For example, the busbars may beused to transport power between a generator and a motor. However, knowncurrent carrying systems have a limited current carrying capacity due,at least partially, to thermal limits associated with the busbars. Morespecifically, known busbars that carry more than a rated amount ofcurrent are susceptible to overheating, possibly damaging the busbar,the current carrying system, and/or the electrical devices coupled tothe busbar.

Generally, the current carrying capacity of a busbar is determined bythe amount of electrically conductive material utilized in constructingeach of the busbars. Specifically, increasing the amount of electricallyconductive material in the busbar facilitates reducing the currentdensity in the busbar when an equal current is being carried. Thereduced current density reduces the temperature increase of the busbarcaused by resistive current losses, and allows additional current to becarried. However, electrically conductive material, such as copper, isoften expensive and/or difficult to acquire. Accordingly, known methodsof increasing the current carrying capacity of the system addsignificant manufacturing costs.

In other known current carrying systems, current carrying capacity isincreased by actively cooling the busbar, e.g., with active coolingelements such as fans or blowers. The active cooling elements cause airto flow over the busbars increasing convective heat transfer from thebusbars to the surrounding air. However, active cooling components havesignificant drawbacks. For example, active cooling components typicallyrequire a separate power source to operate, require a significant amountof space to operate, and require continuous maintenance to preventoverheating of the busbars. Accordingly, current carrying systems withactive cooling components may be more expensive and complicated tomanufacture than passive current carrying systems.

BRIEF DESCRIPTION

In one aspect, a current carrying system for use in transportingelectrical current between a plurality of electrical devices isprovided. The current carrying system includes a busbar having a firstaxial end, a second axial end, an electrically conductive shaftextending from the first axial end to the second axial end, and at leastone cooling feature defined in at least a portion of the electricallyconductive shaft. The current carrying system also includes a casingthat defines a busbar channel configured to receive the busbar such thatthe casing at least partially circumscribes the busbar. The currentcarrying system also includes an air vent defined by the at least onecooling feature and the casing, wherein the air vent is in flowcommunication with ambient air, and the cooling feature is configured tofacilitate a flow of air from the ambient air through the air vent.

In another aspect, a busbar for transporting electrical power between aplurality of electrical components is provided. The busbar includes afirst axial end, a second axial end, and an electrically conductiveshaft extending from the first axial end to the second axial end. Theshaft is at least partially circumscribed by a casing. The busbar alsoincludes at least one cooling feature defined in at least a portion ofthe electrically conductive shaft, the at least one cooling feature andthe casing defining an air vent in flow communication with ambient air,the at least one cooling feature configured to facilitate a flow of theambient air through the air vent.

In yet another aspect, a method of assembling a current carrying systemfor transporting electrical power between a plurality of electricalcomponents is provided. The method includes providing a busbar having afirst axial end, a second axial end, an electrically conductive shaftextending from the first axial end to the second axial end, and at leastone cooling feature defined in at least a portion of the electricallyconductive shaft, and coupling a casing to at least a portion of thebusbar, wherein an inner surface of the casing at least partiallycircumscribes the busbar, wherein the at least one cooling feature andthe inner surface of the casing define an air vent, and wherein the atleast one cooling feature is configured to facilitate a flow of theambient air through the air vent.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of an exemplary current carrying system foruse in transporting power between a plurality of electrical components.

FIG. 2 is an axial cross-sectional view of the current carrying systemshown in FIG. 1.

FIG. 3 is a side cross-sectional view of the current carrying systemshown in FIG. 1.

FIG. 4 is a perspective view of a busbar for use in transporting powerbetween a plurality of electrical components.

FIG. 5 is a view of an exemplary cross-sectional profile of the busbarshown in FIG. 4.

FIG. 6 is a view of a first alternative cross sectional profile of thebusbar shown in FIG. 4.

FIG. 7 is a view of a second alternative cross-sectional profile of thebusbar shown in FIG. 4.

FIG. 8 is a view of a third alternative cross-sectional profile of thebusbar shown in FIG. 4.

FIG. 9 is a view of a fourth alternative cross-sectional profile of thebusbar shown in FIG. 4.

FIG. 10 is a view of a fifth alternative cross-sectional profile of thebusbar shown in FIG. 4.

DETAILED DESCRIPTION

The current carrying system described herein has profiled busbars withat least one cooling feature. The cooling feature facilitates increasingconvective heat transfer by the busbar and reducing the amount ofelectrically conductive material used in fabricating the busbar.Accordingly, the current carrying systems described herein have areduced capital cost. The current carrying systems described herein alsohave an increased current carrying capacity. Furthermore, the currentcarrying systems described herein are less likely to overheat and bedamaged.

FIG. 1 is an exploded view of an exemplary current carrying system 10for use in transporting current between a plurality of electricaldevices (not shown). Current carrying system 10 has at least one busbar12 that is configured to deliver the current between the plurality ofelectrical devices. Busbar 12 includes a first axial end 14, a secondaxial end 16, and an electrically conductive shaft 18 that extendsbetween first axial end 14 and second axial end 16. Shaft 18 isfabricated with an electrically conductive material, e.g., withoutlimitation, copper, aluminum, gold, zinc, nickel, silver, and/or anyother material that enables busbar 12 to transport current from oneelectrical device to another. In the exemplary embodiment, busbar 12also includes a cooling feature 20, i.e., a notch, groove, cut-out,and/or void space, defined in shaft 18 from first axial end 14 to secondaxial end 16. Alternatively, cooling feature 20 may be defined in only aportion of shaft 18. Cooling feature 20 facilitates improving convectiveheat transfer by busbar 12. In addition, cooling feature 20 facilitatesreducing the cost of busbar 12 by reducing the amount of conductivematerial used in fabricating busbar 12 for the same rated current.

In the exemplary embodiment, busbar 12 is fabricated in an extrusionprocess during which the electrically conductive material is forcedthrough a shaped die such that shaft 18 has a substantially uniformcross-sectional shape conforming to the die. Alternatively, busbar 12may be fabricated using any other process that enables busbar 12 tofunction as described herein. Busbar 12 is configured to transportcurrents for any type of power, such as, for example, DC (directcurrent) power, single phase AC (alternating current) power, and/or truethree-phase power.

In the exemplary embodiment, busbar 12 is oriented substantiallyvertically with respect to the earth such that warmed air within coolingfeature 20 rises substantially vertically along electrically conductiveshaft 18 toward first axial end 14. Alternatively, busbars 12 may beoriented at any angle with respect to the earth such that the warmed airrises toward first axial end 14.

Current carrying system 10 also includes a casing 22 that at leastpartially circumscribes busbars 12. More specifically, casing 22includes a first barrier 24 and a second barrier 26 coupled to firstbarrier 24. In the example embodiment, first barrier 24 and secondbarrier 26 are fabricated from a solid dielectric material, e.g.,without limitation, glastic, glass, porcelain, plastic, silicon, quartz,etc. Alternatively, first barrier 24 and second barrier 26 may befabricated from any type of material so long as an inner surface 28 offirst barrier 24 and an inner surface 30 of second barrier 26 areelectrically insulated. In one embodiment, first barrier 24 has an axialcross-sectional profile defined by a plurality of alternating recesses32 and projections 34 such that, when assembled, casing 22 defines atleast one busbar channel (not shown in FIG. 1) configured to receivebusbar 12.

FIG. 2 is a cross-sectional view of current carrying system 10 (shown inFIG. 1) having at least one profiled busbar 12 to facilitate convectiveheat transfer. First barrier 24 has a plurality of alternating recesses32 and projections 34 such that first barrier 24 has a substantiallycorrugated cross-sectional profile. In one embodiment, first barrier 24has a uniform cross-sectional profile throughout. Alternatively,recesses 32 and projections 34 may have varying widths throughout firstbarrier 24. Second barrier 26 has a substantially rectangularcross-sectional profile and is coupled to first barrier 24. Morespecifically, inner surface 30 of second barrier 26 couples with innersurface 28 of first barrier 24 at each projection 34. Furthermore,recesses 32 define a plurality of busbar channels 36 between innersurface 28 and inner surface 30. In the exemplary embodiment, recesses32 and projections 34 are substantially rectangular in shape such thatbusbar channels 36 have a substantially rectangular profile.Alternatively, recesses 32 and projections 34 may have any shape suchthat enables busbar channels 36 to operate as described herein. Forexample, busbar channels 36 may have a substantially hemispheric,circular, trapezoidal, or other shaped profile. In one embodiment busbarchannels 36 may vary

In the exemplary embodiment, a plurality of busbars 12 are positionedwithin respective busbar channels 36 of casing 22. More specifically,the plurality of busbars 12 are positioned within busbar channel 36 suchthat cooling feature 20 defines an air vent 42 between busbar 12 andinner surface 28 and/or inner surface 30 of casing 22. In oneembodiment, the plurality of busbars 12 are positioned within busbarchannels 36 such that a first edge 38 and second edge 40 of at least aportion of each busbar 12 are coupled to inner surface 28 of casing 22.In another embodiment, at least a portion of each busbar 12 is fittedwithin a respective busbar channel 36 such that the portion of busbar 12has a tight tolerance with busbar channel 36 except at cooling feature20.

In the exemplary embodiment, air vent 42 is defined axially throughoutcurrent carrying system 10 from first axial end 14 to second axial end16. Alternatively, air vent 42 may be defined along only a portion ofbusbar 12. Air vent 42 is configured to receive air from the ambientenvironment, for example, proximate to second axial end 16, and to expelwarmed air to the ambient environment, for example, proximate firstaxial end 14. More specifically, air vent 42 is configured to channelair from the ambient environment through cooling feature 20 tofacilitate convective heat transfer by busbar 12. As used herein,‘ambient air’ refers to air from the ambient environment outside of(i.e., above, below, or otherwise external to) casing 22.

FIG. 3 is a side cross-sectional view of the current carrying system 10(shown in FIG. 1). FIG. 3 illustrates the flow of air 44 throughoutcurrent carrying system 10. More specifically, during operation, anelectrical current flows through busbar 12 from one electrical device(not shown) to another electrical device (not shown). Resistive lossescaused by the flow of current through busbar 12 produce heat thatconducts from busbar 12 to first barrier 24 and/or second barrier 26.The produced heat is convected from busbar 12 to air 44 within air vent42. As air 44 within air vent 42 is warmed by busbar 12, the warmed air44 flows through cooling feature 20 toward first axial end 14. In oneembodiment, air 44 is expelled at an apex opening 46 that defines thetop axial end of air vent 42 proximate first axial end 14 of busbar 12.Alternatively, air 44 may exit air vent 42 through any other openingthat enables air vent 42 to operate as described herein. As air 44 exitsapex opening 46, a negative air pressure is formed within air vent 42.The negative air pressure entrains air 44 from the ambient environmentinto air vent 42 through, for example, a base opening 48. Base opening48 defines the bottom axial end of air vent 42 and is proximate secondaxial end 16 of busbar 12. Alternatively, air 44 may enter air vent 42through any other opening. This chimney effect generates a continuousdraft through cooling feature 20 and air vent 42 to facilitate passivelycooling busbar 12 through convective heat transfer.

In the exemplary embodiment, casing 22 has one or more air passages 50defined therein for entraining air 44 from the ambient environment toair vent 42. Air passages 50 are conduits that extend through casing 22from inner surface 28 and/or 30 (shown in FIG. 2) to respective outersurfaces 52 and/or 54. More specifically, air passages 50 have an outeropening 56 defined by outer surface 52 and/or 54 and an inner opening 58defined by respective inner surface 28 and/or 30. In some embodiments,air passages 50 extend through casing 22 partially in an axialdirection, i.e., vertically. More specifically, air passages 50 extendaxially through casing 22 such that inner openings 58 are spaced axiallyapart from outer openings 56. In such an implementation, air passage 50enables air 44 to flow into air vent 42 with a velocity component atleast partially in the same direction as air 44 flowing through coolingfeature 20.

In the exemplary embodiment, the plurality of air passages 50 are shapedas rectangular slits that extend from inner surface 28 and/or 30 toouter surface 52 and/or 54. Alternatively, the plurality of air passages50 may have any cross-sectional shape, including for example circular,that enables air passages 50 to operate as described herein. Further, inthe exemplary embodiment, the plurality of air passages 50 are spacedaxially apart at predetermined intervals 59 along casing 22 such thatair 44 enters air vent 42 at a plurality of axially displaced locations.

In operation, air passages 50 transport air 44 from the ambientenvironment through casing 22 into air vent 42. Air 44 flows throughcooling feature 20 of air vent 42 to facilitate passively coolingbusbars 12. More specifically, as warmed air 44 is expelled from apexopening 46, negative air pressure in air vent 42 generates a draft thatentrains air 44 to flow from the ambient environment through airpassages 50 to air vent 42. The flow of air 44 over through coolingchannel 20 facilitates improving heat convection by busbar 12.

In one embodiment, first barrier 24 and second barrier 26 are assembledsuch that busbar channel 36 circumscribes busbars 12 with a tighttolerance except at cooling feature 20. Accordingly, each air vent 42 isdefined substantially by cooling feature 20 and inner surface 28 or 30of casing 22.

FIG. 4 is an isometric view of one of the plurality of busbars 12 shownin FIG. 1. As described above, busbar 12 has a first axial end 14 and asecond axial end 16 with an electrically conductive shaft 18 extendingtherebetween. In the exemplary embodiment, Busbar 12 is a twistedconductor that facilitates coupling busbar 12 with additionalcomponents, such as a horizontal busbar (not shown). More specifically,busbar 12 has a twisted portion 60 defined in shaft 18 that rotates aface 62 from a first orientation proximate first axial end 14 to asecond orientation proximate second axial end 16. Twisted portion 60 isdefined over any length of electrically conductive shaft 18 to controlthe rate at which face 62 changes orientation. For example, twistedportion 60 may be defined by a relatively short section of shaft 18 suchthat the orientation of face 62 changes rapidly from the firstorientation to the second orientation. Alternatively, twisted portion 60may be defined over a relatively long section of shaft 18 such that face62 slowly changes from the first orientation to the second orientation.In other embodiments, shaft 18 is substantially straight and does notinclude a twisted portion 60.

In the exemplary embodiment, busbar 12 also includes a plurality ofreceiving slots 64 that extend through electrically conductive shaft 18.Each receiving slot 64 is configured to receive at least one fastener(not shown), e.g., without limitation a screw, a bolt, a clip, a pin, anadhesive compound, and/or any other element that is capable of couplingbusbar 12 to another electrical device. For example, busbar 12 may becoupled to a horizontal busbar (not shown) to further transport currentfrom a first electrical device to a second electrical device.

FIG. 5 is a view of an exemplary axial cross-sectional profile 100 ofbusbar 12 (shown in FIG. 1) for use in current carrying system 10 (shownin FIG. 1). Profile 100 has a top region 102, a bottom region 104, and asubstantially solid rectangular central region 106 that extends from topregion 102 to bottom region 104. Top region 102 includes a pair of fins108 that extend away from central region 106 and define a coolingfeature 110 therebetween. In the exemplary embodiment, fins 108 extendfrom central region 106 and curve radially inward toward each other. Insuch an embodiment, fins 108 facilitate clipping an electrical device(not shown) to busbar 12. More specifically, a clip (not shown) couplesbusbar 12 and the electrical device together, and curved fins 108facilitate reducing the pressure exerted by the clip on top region 102.Accordingly, the clip does not exert full pressure on busbar 12 until itreaches central region 106. Although shown as a pair of fins 108, topregion 102 may include any number of fins that define any number ofcooling features 110. In the exemplary embodiment, cooling feature 110is a substantially elliptical and/or circular notch defined in topregion 102.

In the example embodiment, bottom region 104 is substantiallysymmetrical with top region 102 about an axis 112 extending throughcentral region 106. Specifically, bottom region 104 includes a secondpair of fins 114 that extend away from central region 106 and define asecond cooling feature 116 therebetween. Alternatively, bottom region104 may have a different number of fins 114 and/or cooling features 116.For example, bottom region 104 may not have any fins 114, and may besubstantially solid with a hemispheric shape.

As used herein, the terms top, bottom, left, and right, are used merelyfor explanation of the figures and are not limiting with respect to theorientation of the object in physical space. For example, a top regionmay be physically located evenly with or below a bottom region.

FIG. 6 is a view of a first alternative axial cross-sectional profile200 of busbar 12 (shown in FIG. 1) for use in current carrying system 10(shown in FIG. 1). In the first alternative embodiment, profile 200 hasa top region 202, a bottom region 204, and a substantially solidrectangular central region 206 that extends from top region 202 tobottom region 204. Top region 202 includes a pair of fins 208 thatextend away from central region 206 and define a cooling feature 210therebetween. Fins 208 extend away from central region 206 and aresubstantially straight and parallel to each other such that coolingfeature 210 is substantially U-shaped. Additionally, bottom region 204extends away from central region 206 and has a hemispheric shape. Bottomregion 204 is substantially solid and does not include a cooling feature210.

FIG. 7 is a view of a second alternative axial cross-sectional profile300 of busbar 12 (shown in FIG. 1) for use in current carrying system 10(shown in FIG. 1). In the second alternative embodiment, profile 300 hasa top region 302, a bottom region 304, and a central region 306 thatextends from top region 302 to bottom region 304. Top region 302includes a pair of fins 308 that extend away from central region 306 anddefine a cooling feature 310 therebetween. Specifically, fins 308 extendaway from central region 306 and curve radially inward toward each othersuch that cooling feature 310 is substantially elliptical in shape.Additionally, bottom region 304 extends away from central region 306 andhas a substantially solid hemispheric shape.

FIG. 8 is a view of a third alternative axial cross-sectional profile400 of busbar 12 (shown in FIG. 1) for use in current carrying system 10(shown in FIG. 1). In the third alternative embodiment, profile 400 hasa top region 402, a bottom region 404, and a central region 406 thatextends from top region 402 to bottom region 404. Top region 402includes a pair of fins 408 that extend away from central region 406 anddefine a cooling feature 410 therebetween. Specifically, fins 408 extendstraight away from central region 406 and are parallel to each othersuch that cooling feature 410 is substantially U-shaped. Additionally,bottom region 404 extends away from central region 406 and issubstantially symmetric with top region 402 about a central axis 412.Specifically, bottom region 404 includes a second pair of fins 414extending away from central region 406. Second pair of fins 414 define asecond cooling feature 416 having a substantially U-shaped profiletherebetween.

FIG. 9 is a view of a fourth alternative axial cross-sectional profile500 of busbar 12 (shown in FIG. 1) for use in current carrying system 10(shown in FIG. 1). In the fourth alternative embodiment, profile 500 hasa top region 502, a bottom region 504, and a central region 506 thatextends from top region 502 to bottom region 504. Top region 502includes a pair of fins 508 that extend away from central region 506 andcurve radially inward toward each other. Fins 508 define a portion ofcooling feature 510 therebetween. Bottom region 504 includes a pair offins 512 that extend away from central region 506 in an oppositedirection to top region 502 and curve radially inward toward each other.Fins 512 also define a portion of cooling feature 510 therebetween.Cooling feature 510 extends from top region 502 to bottom region 504. Afirst opening 514 extends through top region 502 to cooling feature 510and a second opening 516 extend through bottom region 504 to coolingfeature 510.

FIG. 10 is a view of a fifth alternative axial cross-sectional profile600 of busbar 12 (shown in FIG. 1) for use in current carrying system 10(shown in FIG. 1). In the fifth alternative embodiment, profile 600 hasa top region 602, a bottom region 604, and a central region 606 thatextends from top region 602 to bottom region 604. Top region 602includes a fin 608 that extends away from central region 606, forexample from the center of central region 606. Fin 608 defines a portionof first cooling feature 610 on a first side 612 and a portion of asecond cooling feature 614 on a second side 616. Bottom region 604extends away from central region 606 and has a substantially solidhemispheric shape. Central region 606 is solid and has a substantiallyrectangular shape.

Although described above with respect to several alternativecross-sectional busbar profiles, the present disclosure contemplatesthat additional cross-sectional profiles may be understood to one ofordinary skill in the art in view of the disclosure. Features of any ofthe described embodiments may be included with features of any otherembodiment such that current carrying system 10 functions as describedherein. Furthermore, although described with respect to a plurality ofbusbars 12, current carrying system 10 may include only a single busbar.

The embodiments described herein provide a current carrying systemhaving a profiled busbar that facilitates increased current carryingcapacity and/or increased heat transfer. More specifically, the currentcarrying system described herein includes a plurality of profiledbusbars having at least one cooling feature, such as a notch, groove,void space, and/or cut-out, defined therein. The cooling features aredefined axially through at least a portion of the busbar, and facilitatereducing the amount of electrically conductive material used infabricating the busbar as compared to a solid busbar. The currentcarrying system also includes a casing including a plurality ofbarriers, e.g., without limitation, dielectric and/or glastic barriers.When assembled, the barriers define a plurality of busbar channelsconfigured to receive respective busbars. In particular, each of theplurality of busbars is positioned within a respective busbar channelsuch that at least a portion of the busbar is fitted within the busbarchannel with a tight tolerance except for at the cooling feature. Thecooling features are formed on the outer surface of the busbars suchthat the cooling features and the inner surface of the casing define aplurality of air vents. The air vents are in flow communication with airin the ambient environment and facilitate convective heat transfer bythe busbars. More specifically, each air vent entrains relatively coolair from the ambient environment through at least one opening into therespective air vent. The operation of the cooling features to passivelygenerate a draft that entrains relatively cool air into the air vent isreferred to herein as the “chimney effect”. In one embodiment, thecasing includes at least one air passage that extends through the casingfrom the ambient environment to the air vent. The draft generated by thecooling features also entrains air through respective air passages tofurther facilitate convective heat transfer by the busbars.

The current carrying system described above facilitates increasingconvective heat transfer by the busbars while reducing the cost of thebusbar for the same rated current. The current carrying systemsdescribed herein also have an increased current carrying capacity,enabling more cost effective busbars to provide greater amounts ofcurrent to electrical devices. Furthermore, the current carrying systemsdescribed herein are less likely to be damaged or damage otherelectrical devices due to overheating.

Exemplary embodiments of systems and methods for cooling a busbar aredescribed above. The systems and methods are not limited to the specificembodiments described herein but, rather, components of the systemsand/or operations of the methods may be utilized independently andseparately from other components and/or operations described herein.Further, the described components and/or operations may also be definedin, or used in combination with, other systems, methods, and/or devices,and are not limited to practice with only the systems described herein.

The order of execution or performance of the operations in theembodiments of the invention illustrated and described herein is notessential, unless otherwise specified. That is, the operations may beperformed in any order, unless otherwise specified, and embodiments ofthe invention may include additional or fewer operations than thosedisclosed herein. For example, it is contemplated that executing orperforming a particular operation before, contemporaneously with, orafter another operation is within the scope of aspects of the invention.

Although specific features of various embodiments of the invention maybe shown in some drawings and not in others, this is for convenienceonly. In accordance with the principles of the invention, any feature ofa drawing may be referenced and/or claimed in combination with anyfeature of any other drawing.

This written description uses examples to disclose the invention,including the best mode, and also to enable any person skilled in theart to practice the invention, including making and using any devices orsystems and performing any incorporated methods. The patentable scope ofthe invention is defined by the claims, and may include other examplesthat occur to those skilled in the art. Such other examples are intendedto be within the scope of the claims if they have structural elementsthat do not differ from the literal language of the claims, or if theyinclude equivalent structural elements with insubstantial differencesfrom the literal language of the claims.

What is claimed is:
 1. A current carrying system for use in transportingelectrical current between a plurality of electrical devices, saidcurrent carrying system comprising: a busbar comprising a first axialend, a second axial end, an electrically conductive shaft extending fromthe first axial end to the second axial end, and at least one coolingfeature defined in at least a portion of said electrically conductiveshaft; a casing that defines a busbar channel configured to receive saidbusbar such that said casing at least partially circumscribes saidbusbar; and an air vent defined by said at least one cooling feature andsaid casing, said air vent comprising an apex opening proximate saidfirst axial end and a base opening proximate said second axial end,wherein said air vent is in flow communication with ambient air, andwherein said at least one cooling feature is configured to facilitate aflow of the ambient air through said air vent.
 2. The current carryingsystem of claim 1, wherein said at least one cooling feature is at leastone of a notch, a cut-out, a void space, and a groove.
 3. The currentcarrying system of claim 1, wherein said casing comprises a firstbarrier and a second barrier coupled to said first barrier, and whereinsaid first barrier is coupled to at least a portion of said busbar. 4.The current carrying system of claim 3, wherein said first barriercomprises a plurality of alternating recesses and projections, saidprojections configured to be coupled to said second barrier, and saidrecesses configured to define said busbar channel.
 5. The currentcarrying system of claim 1, wherein said casing comprises an air passagethat extends from the ambient air to said air vent, said air passageconfigured to entrain air from the ambient environment into said airvent.
 6. The current carrying system of claim 1, wherein said busbar hasa cross-sectional profile including a top region, a bottom region, and asubstantially solid rectangular central region extending therebetween.7. A current carrying system for use in transporting electrical currentbetween a plurality of electrical devices, said current carrying systemcomprising: a busbar comprising a first axial end, a second axial end,an electrically conductive shaft extending from the first axial end tothe second axial end, and at least one cooling feature defined in atleast a portion of said electrically conductive shaft; a casingcomprising a first barrier and a second barrier coupled to said firstbarrier, said first barrier comprising a plurality of alternatingrecesses and projections, said projections configured to be coupled tosaid second barrier, said recesses configured to define a busbar channelconfigured to receive said busbar such that said casing at leastpartially circumscribes said busbar, wherein said first barrier iscoupled to at least a portion of said busbar; and an air vent defined bysaid at least one cooling feature and said casing, wherein said air ventis in flow communication with ambient air, and wherein said at least onecooling feature is configured to facilitate a flow of the ambient airthrough said air vent.
 8. The current carrying system of claim 7,wherein said at least one cooling feature is at least one of a notch, acut-out, a void space, and a groove.
 9. The current carrying system ofclaim 7, wherein said air vent comprises an apex opening proximate saidfirst axial end and a base opening proximate said second axial end. 10.The current carrying system of claim 7, wherein said casing comprises anair passage that extends from the ambient air to said air vent, said airpassage configured to entrain air from the ambient environment into saidair vent.
 11. The current carrying system of claim 10, wherein said airpassage has an inner opening and an outer opening axially spaced fromsaid inner opening.
 12. The current carrying system of claim 11, whereinsaid inner opening is positioned vertically above said outer opening toenable a velocity component of the air in said air passage to be in thesame direction as the air in said air vent.
 13. A current carryingsystem for use in transporting electrical current between a plurality ofelectrical devices, said current carrying system comprising: a busbarcomprising a first axial end, a second axial end, an electricallyconductive shaft extending from the first axial end to the second axialend, and at least one cooling feature defined in at least a portion ofsaid electrically conductive shaft, said busbar further comprising across-sectional profile including a top region, a bottom region, and asubstantially solid rectangular central region extending therebetween,said top region comprising a pair of fins that extend away from saidcentral region in a curved manner and define said at least one coolingfeature therebetween; a casing that defines a busbar channel configuredto receive said busbar such that said casing at least partiallycircumscribes said busbar; and an air vent defined by said at least onecooling feature and said casing, wherein said air vent is in flowcommunication with ambient air, and wherein said at least one coolingfeature is configured to facilitate a flow of the ambient air throughsaid air vent.
 14. The current carrying system of claim 13, wherein saidat least one cooling feature is at least one of a notch, a cut-out, avoid space, and a groove.
 15. The current carrying system of claim 13,wherein said air vent comprises an apex opening proximate said firstaxial end and a base opening proximate said second axial end.
 16. Thecurrent carrying system of claim 13, wherein said casing comprises afirst barrier and a second barrier coupled to said first barrier, andwherein said first barrier is coupled to at least a portion of saidbusbar.
 17. The current carrying system of claim 13, wherein said casingcomprises an air passage that extends from the ambient air to said airvent, said air passage configured to entrain air from the ambientenvironment into said air vent.
 18. A busbar for use in transportingelectrical current between a plurality of electrical devices, saidbusbar comprising: a first axial end, a second axial end, and anelectrically conductive shaft extending from said first axial end tosaid second axial end, said electrically conductive shaft comprising across-sectional profile comprising a top region, a bottom region, and asubstantially solid rectangular central region extending therebetween,wherein said electrically conductive shaft is at least partiallycircumscribed by a casing; and at least one cooling feature defined inat least a portion of said electrically conductive shaft, said topregion of said electrically conductive shaft comprising a pair of finsthat extend away from said central region in a curved manner and definesaid at least one cooling feature therebetween, said at least onecooling feature and the casing defining an air vent in flowcommunication with ambient air, said at least one cooling featureconfigured to facilitate a flow of the ambient air through said airvent.
 19. The busbar of claim 18, wherein said at least one coolingfeature is at least one of a notch, a cut-out, a void space, and agroove.
 20. The busbar of claim 18, wherein the casing has an airpassage that extends from the ambient air to said air vent, said airpassage configured to entrain air from the ambient environment throughsaid at least one cooling feature.